GTK4: New way of querying the mouse pointer position. The old code was completely bogus and did not work at all. Since there doesn't seem to be a way to actually query the position... Plus with wayland there are no global coordinates... instead... Any event we handle that has pointer coordinates... we convert them to be window relative and save them. When querying the pointer location, we return the latest coordinates that we had handled. I removed the thread safety since there are no API calls, but we may want to put it back so that the data doesn't get changed during the call... although that may not be the most tragic thing.